Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets and Liabilities Other Than Goodwill -Amounts related to intangible assets (Details)

Intangible Assets and Liabilities Other Than Goodwill -Amounts related to intangible assets (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 3,677,179	$ 3,498,307
Less - accumulated amortization	(726,146)	(601,849)
Intangible assets, net	2,951,033	2,896,458
Unfavorable contract liability	7,912,275	8,341,922
Less - accumulated amortization	(1,129,667)	(612,255)
Unfavorable contract liability, net	6,782,608	7,729,667
Product Certifications
Finite-Lived Intangible Assets [Line Items]
Intangible assets	701,319	605,704
Less - accumulated amortization	(313,964)	(285,341)
Intangible assets, net	387,355	320,363
Patents
Finite-Lived Intangible Assets [Line Items]
Intangible assets	858,888	808,323
Less - accumulated amortization	(168,475)	(154,972)
Intangible assets, net	690,413	653,351
Developed Technology
Finite-Lived Intangible Assets [Line Items]
Intangible assets	240,000	240,000
Less - accumulated amortization	(84,000)	(76,000)
Intangible assets, net	156,000	164,000
Favorable contract asset
Finite-Lived Intangible Assets [Line Items]
Intangible assets	1,561,739	1,561,739
Less - accumulated amortization	(158,782)	(85,536)
Intangible assets, net	1,402,957	1,476,203
TTcogen Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Intangible assets	29,607	0
Less - accumulated amortization	(925)	0
Intangible assets, net	28,682	0
Trademarks
Finite-Lived Intangible Assets [Line Items]
Intangible assets	21,690	19,540
Less - accumulated amortization	0	0
Intangible assets, net	21,690	19,540
In Process R&D
Finite-Lived Intangible Assets [Line Items]
Intangible assets	263,936	263,001
Less - accumulated amortization	0	0
Intangible assets, net	$ 263,936	$ 263,001